Ram Base - Rail With Zinc Coated U-bolt - Ram Mounts

RAM® Rail Base with Zinc-Coated U-Bolt & 1" Ball – RAM-B-231ZU

The RAM-B-231ZU Rail Base is a rugged and versatile mounting solution designed for handlebars, rails, and round tubing. Featuring a 25mm (1") B-size rubber ball positioned at a right angle to the mounting rail, this base provides a secure and stable platform for attaching any RAM® B-size double socket arm and device cradle.

The included zinc-coated U-bolt fits a wide range of rail diameters—from 12.7mm to 31.75mm (0.5" to 1.25")—making it ideal for motorcycles, ATVs, bicycles, boats, and industrial equipment. Black cover caps and a composite spacer are included for a clean, professional installation.

Key Features

• Zinc-Coated U-Bolt Base: Designed to sit at right angles to the mounting rail for optimal positioning.
• Wide Compatibility: Fits rails from 12.7mm to 31.75mm (0.5" to 1.25") in diameter.
• B-Size 1" Ball: Works with all RAM® B-size arms and accessories.
• Durable Construction: Made from powder-coated, marine-grade aluminum for long-lasting performance.
• Lifetime Warranty: Backed by RAM Mounts’ industry-leading guarantee.

U-Bolt Dimensions

• Accommodates rails from 12.7mm to 31.75mm (0.5" to 1.25")

Hardware Included

• (1) 6.3mm-20 (1/4"-20) U-Bolt for 12.7mm – 25mm rails
• (1) 6.3mm-20 (1/4"-20) U-Bolt for 25mm – 31.75mm rails
• (2) 6.3mm-20 (1/4"-20) Nylock nuts
• (2) Rubber caps
• (1) U-bolt spacer

Ball / Socket Size

• B Size – 25mm (1")

Materials

• Marine-grade aluminum

Manufacturer Details

• Manufacturer: National Products Inc.
• Brand: RAM Mount
• Country of Import: USA